I'm struggling to find a way to apply this working out with the above two problems.
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Any help is much appreciated.

Thank you!

To find concentration of apple juice in the solution, you must calculate total grams of apple divided by total volume of the solution. Let's find total volume first. 10mL of apple juice + 100 mL of water = 110 mL solution. Now let's find total grams of apple using the given density. 1g/mL apple juice * 10 mL of apple juice = 10 g of apple juice.

10 g apple juice/ 110 mL solution = 1g/11mL apple juice. This is the concentration of apple juice. You can do this for the following question as well. Try it out!